// Copyright 2017 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.
using Esri.ArcGISRuntime;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Mapping;
using System;
using Xamarin.Forms;
namespace ArcGISRuntime.Samples.TimeBasedQuery
{
[ArcGISRuntime.Samples.Shared.Attributes.Sample(
"Time-based query",
"Layers",
"This sample demonstrates how to apply a time-based parameter to a feature layer query.",
"")]
public partial class TimeBasedQuery : ContentPage
{
// Hold a URI pointing to the feature service
private Uri _serviceUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Hurricanes/MapServer/0");
// Hold a reference to the feature table used by the sample
private ServiceFeatureTable _myFeatureTable;
public TimeBasedQuery()
{
InitializeComponent();
Title = "Time-based query";
Initialize();
}
private void Initialize()
{
// Create a new map with oceans basemap
Map myMap = new Map(Basemap.CreateOceans());
// Create feature table for the hurricane feature service
_myFeatureTable = new ServiceFeatureTable(_serviceUri);
// Define the request mode
_myFeatureTable.FeatureRequestMode = FeatureRequestMode.ManualCache;
// When feature table is loaded, populate data
_myFeatureTable.LoadStatusChanged += OnLoadedPopulateData;
// Create FeatureLayer that uses the created table
FeatureLayer myFeatureLayer = new FeatureLayer(_myFeatureTable);
// Add created layer to the map
myMap.OperationalLayers.Add(myFeatureLayer);
// Assign the Map to the MapView
MyMapView.Map = myMap;
}
private async void OnLoadedPopulateData(object sender, LoadStatusEventArgs e)
{
// If layer isn't loaded, do nothing
if (e.Status != LoadStatus.Loaded) { return; }
// Create new query object that contains a basic 'include everything' clause
QueryParameters queryParameters = new QueryParameters()
{
WhereClause = "1=1"
};
// Create a new time extent that covers the desired interval (beginning of time to September 16th, 2000)
TimeExtent myExtent = new TimeExtent(new DateTime(1, 1, 1), new DateTime(2000, 9, 16));
// Apply the time extent to the query parameters
queryParameters.TimeExtent = myExtent;
// Create list of the fields that are returned from the service
var outputFields = new string[] { "*" };
// Populate feature table with the data based on query
await _myFeatureTable.PopulateFromServiceAsync(queryParameters, true, outputFields);
}
}
}